* {
  padding: 0;
  margin: 0;
}

header {
  font-weight: bold;
  font-size: 2em;
  text-align: center;
}

.wrap {
  position: relative;
  width: 400px;
  height: 600px;
  margin: 0px auto;
  border: 1px solid #333;
  overflow: hidden;
}

.wrap button {
  position: absolute;
  top: 0;
  z-index: 1024;
  border: none;
  vertical-align: top;
  background: none;
  outline: none;
  cursor: pointer;
  width: 100%;
  height: 100px;
  border-bottom: 3px dashed #eee;
  font-size: 60px;
  color: pink;
  background-color: #fff;
  /* display: none; */
}

.main {
  /*为了让盒子能动起来 */
  position: relative;
  top: -150px;
  width: 400px;
  height: 600px;
  /* border: 1px solid red; */
}

.row {
  height: 150px;
}

.row div {
  float: left;
  width: 100px;
  height: 150px;
  box-sizing: border-box;
  border-left: 1px solid #222;
  border-bottom: 1px solid #222;
  cursor: pointer;
}
